<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 25px;
            height: 25px;
            border:1px gold solid;
        }

        .one{
            background-color: red;
        }
        .two{
            background-color: violet;
        }
        .three{
            background-color: greenyellow;
        }

    </style>
</head>
<body>
    <div class='one'></div>
    <div class='two'></div>
    <div class='three'></div>
</body>
</html>